Download Handout Topic 5,10 Review New 2017-18

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Handout Topic 5, 10-11 New Electromagnetism Review
MULTIPLE CHOICE
1.
2.
Which one of the following is a correct definition of electric potential difference
between two points?
A.
The power to move a small positive charge between the two points.
B.
The work done to move a small positive charge between the two points.
C.
The power per unit charge to move a small positive charge between the two
points.
D.
The work done per unit charge to move a small positive charge between the
two points.
Electric field strength is defined as
A.
the force exerted on a test charge.
B.
the force per unit positive charge.
C.
the force per unit charge.
D.
the force per unit charge exerted on a positive test charge.
1
3.
Two identical spherical conductors X and Y are mounted on insulated stands. X
carries a charge of +8.0 nC and Y carries a charge of –2.0 nC.
–2.0nC
+8.0nC
conductor X
insulated stands
conductor Y
The two conductors are brought into contact and are then separated. Which of the
following gives the charge on each conductor?
Charge on X
Charge on Y
A.
0.0 nC
0.0 nC
B.
+8.0 nC
–2.0 nC
C.
+5.0 nC
+5.0 nC
D.
+3.0 nC
+3.0 nC
2
4.
Two long, vertical wires X and Y carry currents in the same direction and pass
through a horizontal sheet of card.
X
Y
Iron filings are scattered on the card. Which one of the following diagrams best
shows the pattern formed by the iron filings? (The dots show where the wires X and
Y enter the card.)
A.
B.
C.
D.
3
5.
In the circuit below, which meter is not correctly connected?
A
1
3
V
2
A
4
V
6.
A.
1
B.
2
C.
3
D.
4
The electron volt is defined as
–19
A.
a unit of energy exactly equal to 1.6 × 10
J.
B.
1
a fraction 13.6 of the ionization energy of atomic hydrogen.
C.
the energy gained by an electron when it moves through a potential difference
of 1.0 V.
D.
the energy transfer when 1.0 C of charge moves through a potential difference
of 1.0 V.
(1)
4
7.
In the circuit below, n charge carriers pass the point P in a time t. Each charge carrier
has charge q.
P
The current in the circuit is given by the expression
8.
A.
q
t .
B.
nq
t .
C.
qt
n .
D.
nqt.
The element of an electric heater has a resistance R when in operation. What is the
resistance of a second heater that has a power output three times as large at the same
operating voltage?
A.
R
9
B.
R
3
C.
3R
D.
9R
5
9.
10.
A magnetic force acts on an electric charge in a magnetic field when
A.
the charge is not moving.
B.
the charge moves in the direction of the magnetic field.
C.
the charge moves in the opposite direction to the magnetic field.
D.
the charge moves at right angles to the lines of the magnetic field.
Three equal point charges X, Y and Z are fixed in the positions shown.
Z
q3
1 .0 m
90
X
1 .0 m
q1
Y
q2
The distance between q1 and q2 and the distance between q2 and q3 is 1.0 m. The electric
force between the charges at X and Y is F. The electric force between the charges at
X and Z is
A.
F
.
2
F
2
B.
C.
F.
D.
2F.
.
6
11.
Two charges of magnitude +2Q and −plainQ are situated as shown below. At which
point is the electric field due to the two charges most likely to be zero?
–Q
+2Q
A.
12.
C.
B.
D.
The diagram below shows two long parallel plates that are oppositely charged. A
positive test charge +q is placed along the dotted line XY.
+q
X
Y
The charge +q is moved from X to Y. Which one of the following best shows the
variation with distance d from X of the magnitude F of the force on +q?
7
A. F
0
B. F
X
Y
C. F
0
13.
0
d
X
Y
d
X
Y
d
D. F
X
Y
0
d
The currents in two parallel wires are I and 3I in the directions shown in the diagram
below.
wire 1
wire 2
I
3I
The magnetic force on wire 2 due to the current in wire 1 is F. The magnitude of the
force on wire 1 due to the current in wire 2 is
A.
F
.
3
B.
F
.
2
C.
F.
D.
3F.
8
14.
In the circuit below the battery has emf 6.0 V and negligible internal resistance. The
three resistors each have resistance 10 . A high resistance voltmeter is connected as
shown.
6.0 V
10
10
10
V
The reading of the voltmeter is
15.
A.
2.0 V.
B.
3.0 V.
C.
4.0 V.
D.
6.0 V.
X and Y are two identical conducting spheres separated by a distance d. X has a
charge +6 μC and Y has a charge –2 μC. The electric force between them is + F (ie
attractive). The spheres are touched together and are then returned to their original
separation d. The force between them now is
A.
+F.

C.
16.
17.
F
.
3
B.
–F.

D.
F
.
3
A conductor of constant resistance dissipates 6.0 W of power when the potential
difference across it is 12 V. The power that will be dissipated in this conductor when
the potential difference across it is 24 V is
A.
6.0 W.
B.
12 W.
C.
24 W.
D.
48 W.
OMIT
9
18.
The graphs below are the current-voltage (I-V) characteristics of three electrical
components P, Q and R.
component P
component Q
I
0
component R
I
V
0
0
0
I
0
V
V
0
Which component(s) has (have) constant resistance?
A.
P only
B.
R only
C.
P and Q only
D.
P and R only
A resistor of resistance 1.0  is connected in series with a battery. The current in the
circuit is 2.0 A.
The resistor is now replaced by a resistor of resistance of 4.0 . The current in this circuit
is 1.0 A.
19.
  A
2.0 A
1.0 
4.0 
The best estimate for the internal resistance of the battery is
A.
1.0 .
B.
2.0 .
C.
4.0 .
D.
5.0 .
10
20.
A long, straight current-carrying wire is placed normal to the plane of the page. The
current in the wire is into the plane of the page.
Which of the following diagrams best represents the magnetic field around the wire?
21.
A.
B.
C.
D.
The work done on a positive point charge of magnitude 3.0 nC as it is moved at
constant speed from one point to another is 12 nJ. The potential difference between
the two points is
A.
0.0 V.
B.
0.25 V.
C.
4.0 V.
D.
36 V.
11
22.
The graph below shows the variation with current I of the potential difference V
across a filament lamp.
V / volts
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0
0.5
1.0
1.5
2.0
I / mA
The resistance of the lamp when I = 1.5 mA is
A.
950 .
B.
400 .
C.
0.95 .
D.
0.40 .
23.
In the circuit shown below, the cell has negligible internal resistance.
Which of the following equations is correct?
A.
I1 = 2I2
B.
I1 = 2I3
C.
I2 = 2I3
D.
I3 = 2I1
24. OMIT
25.
OMIT
12
26.
This question is about an electric circuit.
A particular filament lamp is rated at 12 V, 6.0 mA. It just lights when the potential
difference across the filament is 6.0 V.
A student sets up an electric circuit to measure the I-V characteristic of the filament
lamp.
In the circuit, shown below, the student has connected the voltmeter and the
ammeter into the circuit incorrectly.
The battery has emf 12 V and negligible internal resistance. The ammeter has negligible
resistance and the resistance of the voltmeter is 100 k. The maximum resistance of
the variable resistor is 15.
(a) Explain, without doing any calculations, whether there is a position of the slide
S at which the lamp will be lit.
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(b) Estimate the maximum reading of the ammeter.
...................................................................................................................................
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(c) Complete the circuit diagram below showing the correct position of the
voltmeter and of the ammeter in order to determine the I-V characteristic of
the filament lamp.
13
27.
This question is about electrical resistance.
(a) Define electrical resistance.
...................................................................................................................................
...................................................................................................................................
(b)
(i)
Three resistors, each of resistance 6.0 , are connected as shown below.
6.0
6.0
A
6.0
B
Calculate the total resistance between point A and point B of this arrangement.
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
(ii)
The arrangement in (b)(i) is now connected to two more resistors, as
shown below. Each resistor is of resistance 6.0 .
6.0
6.0
6.0
A
6.0
B
C
6.0
D
Using your answer in (b)(i), deduce that the total resistance between point C
and point D is 8.4 .
14
28.
This question is about magnetic fields.
(a) Using the diagram below, draw the magnetic field pattern of the Earth.
North
Earth
(b) State what other object produces a magnetic field pattern similar to that of the
Earth.
...................................................................................................................................
(c)
A long vertical wire passes through a sheet of cardboard that is held
horizontal. A small compass is placed at the point P and the needle points in
the direction shown.
cardboard sheet
direction of compass needle
P
A current is passed through the wire and the compass needle now points in a
direction that makes an angle of 30 to its original direction as shown below.
15
direction of compass
needle with current in wire
cardboard sheet
30
P
original direction of
compass needle
Draw an arrow on the wire to show the direction of current in the wire.
Explain why it is in the direction that you have drawn.
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16